TDC7201: Combined Operation

Kato,

Measuring TOF from 0.25 ns to 12 ns requires operating in mode 2 (section 7.4.2.2) where longer durations require mode 1 (section 7.4.2.1). Combined operation is meant to imply that the system is capable of configuring both modes for a complete sensing range.

For details regarding how to configure TDC7201 to measure down to TOF durations of 0.25 ns please refer to the following application note:

https://www.ti.com/lit/an/snaa292/snaa292.pdf

Thanks,

Scott 

Kato-san,

The application note does detail the use of combined operation and how to setup each TDC register set in order to achieve this function.  It also shows the composite data along with the impact from averaging to minimize error.

Thanks,

Scott

Kato,

For combined measurement mode, START1 and START2 are connected together, and based on figures 9 and 10 from the app note (which show the register settings for each TDC) both TDC1 and TDC2 are configured to Mode1.

Thank you,

Scott